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  #1  
Old November 9th, 2013, 12:06 AM
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Bill Ski
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Alternator swap wiring questions

1983 110 with 4 wires going to it from the factory harness. It now has a 1991 RRC Alternator. The 2 larger wires I get they go to the output on the alternator.

The other two however are the question mark for me. Looking at the wiring diagram for the 110 it only shows 3 wires. 2 larger going back to the 12 volt hub and one running to a switched circuit. Not sure what the hell the 4th wire is for. (alt is #75 in the diagram up in the top right corner).

If I remember RRC alternator class with Trevor it needs a 12 volt switched signal to energize the alternator. So I'm guessing that wire would go to the spade connector for that. I'm going to confirm it goes hot with the key on in the morning.

So does anyone know what the 4th wire is for? If it's just another switched wire I can tie them together great if not I need to figure out where to hook it up.

I attached the wiring diagram so that the smart people can tell me where I'm going wrong.
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  #2  
Old November 9th, 2013, 12:22 AM
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Andrew Najarian
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Well, my first suggestion would be to dig up that same wiring schematic for the RRC that the Alternator is out of. It should show the fourth wire and where it goes. From there you can determine if it is switched 12+ or ground or whatever it might be...
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Old November 9th, 2013, 12:42 AM
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Bill Ski
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Sorry the 4th wire is on the 110 not the RRC Alternator. It seems clear in my head when I'm typing it lol
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  #4  
Old November 9th, 2013, 02:21 AM
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Andrew Najarian
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From what I can tell there are three coming off the 110 Alternator, there is are two Brown wires that go to the starter and a Brown with Yellow Tracer that goes to fuse 38. I think I'm confused about something...
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Old November 9th, 2013, 12:17 PM
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Bill Ski
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Join the club according to the wiring diagram I agree completely but there is the 4th wire and I have no clue what the hell it's there for lol.

I'm just going to leave it disconnected and see what doesn't work lol.
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Old November 9th, 2013, 12:31 PM
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Brown/yellow is for the charge warning light only(or ALT light or whatever, but should illuminate on startup and go out quickly thereafter)
Could you tell us what color the wire is that is in question? If it's brown or brown with a secondary tracer it is an always hot feed to something. White would be for a tach signal.
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Old November 9th, 2013, 06:32 PM
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Bill Ski
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I'll have to look tomorrow but I'm pretty sure it was a small all brown wire.

I hooked up just the 3 today and everything is working and charging. So far so good (fingers crossed)
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